Bug 17758

Summary:	OpenGL applications cause kernel to complain "Going to lose the write domain"
Product:	DRI	Reporter:	Ben Gamari <bgamari>
Component:	DRM/other	Assignee:	Default DRI bug account <dri-devel>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium	CC:	jbarnes
Version:	XOrg git
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Ben Gamari 2008-09-24 10:55:03 UTC

On Fedora rawhide the kernel dumps the following messages to the log at a blinding rate while running an opengl application (I know it happens when I run
glxgears and it seems compiz as well, my only two test points),

Sep 16 14:14:50 mercury kernel: [drm:i915_gem_execbuffer] *ERROR* Going to lose 
the write domain on obj 38 size 16777216
Sep 16 14:14:50 mercury kernel: [drm:i915_gem_execbuffer] *ERROR* Going to lose 
the write domain on obj 40 size 16777216

Meanwhile, glxgears consistently shows 40fps without compiz. compiz produces 30 fps and down to 14 while switching workspaces with the desktop wall plugin.

There is a fedora bug for this open at https://bugzilla.redhat.com/show_bug.cgi?id=462495.

Comment 1 Ben Gamari 2008-09-24 11:00:05 UTC

By the way, this is happening on an i965.  running the following packages,

mesa-7.2.0
x11-video-intel-2.4.2
kernel-2.6.27 (with gem patches)
libdrm-2.4.0
xserver-1.5.0

Being a kernel GEM problem, I thought you'd be interested in this, Jesse.

Comment 2 Ben Gamari 2008-09-24 12:50:04 UTC

This seems to be fixed in the latest kernel build (2.6.27-0.352.rc7.git1), although performance still seems to be a little lacking (still stutters with several windows open) and the alpha blended window shadows are solid black.

Comment 3 Eric Anholt 2008-09-29 11:55:29 UTC

The messages and the bug that was being caught by them were fixed some time ago; apparently rawhide didn't pick it up for a while.  For other issues, please open new bugs.  (performance issues associated with high cpu usage will need sysprof/oprofile output, and likely the sha1 of commits that rawhide code was produced from)

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